chrome-developer-tools are the "native" developer tools for the chrome web browser

firebug is the developer tools plugin for the firefox(mozilla) web browser ] inspect ] analyze ] debug ] log ] profile ] layout

Gist is a simple way to share code "snippets" and "pastes" with others. All gists are Git repositories, so they are automatically versioned, forkable and usable from Git.

source code control system, repository, versioning,

js pastebin - Create, share, execute and test your JavaScript right in the browser. This is a great tool for collaborative debugging or for sharing code snippets.

FREE, another linting tool for javascript, not as restrictive as jslint.com,

FREE, online+local, validate your javascript code,

view, edit and format json online, FREE

site for testing your js code performance, can compare native js code to jquery library code or different algorithms for performing a certain operation

create 'generated' javascript documentation

$, javascript IDE + html editor,

performance testing website,

cloud9 IDE - online javascript IDE + workspace (w/ftp,ssh), collaboration, code completion(sorta like ms intellisense), support for VERSION-CONTROL(git & mercurial),

Performance analysis tool for websites, points out areas of concern as well as defining the problem and suggesting solutions

web based ui for git,